Solving Enterprise Integration with Apache Camel
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Talk given at Phoenix Desert Code Camp on enterprise integration, enterprise service bus, and Apache Camel
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Solving Enterprise Integration with Apache Camel
- 1. Solving Enterprise Integration With Apache Camel Christian Posta Principal Consultant and Architect 11/09/13 1
- 2. Agenda • • • • • 2 What is Integration? What is Apache Camel Why Apache Camel? Example Questions?
- 3. Your speaker Christian Posta Blog: http://christianposta.com/blog Twitter: @christianposta Email: christian@redhat.com ceposta@apache.org • Principal Consultant and Architect at Red Hat (FuseSource) • Based in Phoenix, AZ • Committer on Apache Camel, ActiveMQ, Apollo • PMC on ActiveMQ • Author: Essential Camel Components DZone Refcard 3
- 7. Just use one computer. No integration needed. 7
- 8. Why is integration hard? • Off the shelf? Home Grown? Acquisition? • Platforms • Protocols / Data Formats • Data Formats • Timing • Organizational mismatch 8
- 12. Extract the heart of ESB • Protocol mediation • Routing • Transformation • EIPs • Start small, build up • Open Source • Community driven 12
- 13. Patterns FTW! • Common language!!!!! • Specific context • Forces at work • Concrete solution • Guidance • Other patterns… • 65 patterns 13
- 14. What is Apache Camel? 14 14
- 15. Proud parents of Camel 15
- 16. Apache Camel Apache Camel is an open-source, light-weight, integration library. Use Camel to integrate disparate systems that speak different protocols and data formats 16
- 17. Why the name Camel? • Can carry more weight that other beasts? • James fancied the cigarettes? • A horse designed by committee? 17 Concise Application Messaging Exchange Language
- 18. What is Apache Camel? • Light-weight integration library • Enterprise Integration Patterns • Components • Domain Specific Language • Routing and Mediation (like an ESB?) • Runs in any container (or stand alone) 18
- 19. Not an ESB…per-se… • An integration library • • • Routing (content-based, dynamic, rules-engine…) Mediation (xformations, protocols, wire transports…) DSL • Can build an ESB (real ESB.. Not just box in the middle) • Many options based on Camel! • • • • 19 Fuse ESB / JBoss Fuse Apache ServiceMix (Karaf + Camel) Talend, wso2, others… Not tied to vendor lock-in and commercial licenses!
- 21. Quick Example File System 21 Message Oriented Middleware
- 25. Quick Example isWidget = xpath(“/quote/product = ‘widget’”); from(A) .filter(isWidget). to(B) 25
- 27. Very popular • Used at top companies in finance, shipping, retail/e-retail, health care, airline reservations, etc • FAA: http://fusesource.com/collateral/131 • Sabre: http://fusesource.com/collateral/139 • CERN: http://fusesource.com/collateral/103 27
- 28. Open source • Apache Software Foundation • ASL v 2.0 Licensed • Vibrant community • • 28 Jira, mailing list, github Lots of contributions! Check out the components!
- 29. Pipes and Filters • Step by Step – “Processors” in Camel terminology • Complex processing – “Routes” • Flexible • Testing • Reuse 29
- 30. Camel Routes • Defined in Java, XML, Scala, Groovy • Step by step processing of a message: • Consumer – Listen for incoming message • Zero or more “filters” or Processors • Producer – Send outgoing message • Number of processing filters, or “Processors” in Camel-speak • EIPs • Tranform, redirect, enrich 30
- 31. Domain Specific Language • Domain specific (integration) • Used to build and describe Camel Routes • Embedded within a general programming language • Java, Spring XML, Scala, Groovy • Take advantage of existing tools • Fluent builders (builder pattern…) • 31 from(“..”).enrich(“…”).filter(“..”).to(“…”);
- 32. Java DSL public class OrderProcessorRouteBuilder extends RouteBuilder { @Override public void configure() throws Exception { from(“activemq:orders”) .choice() .when(header(“customer-rating”).isEqualTo(“gold”)) .to(“ibmmq:topic:specialCustomer”) .otherwise() .to(“ftp://user@host/orders/regularCustomers”) .end() .log(“received new order ${body.orderId}”) .to(“ibatis:storeOrder?statementType=Insert”); } } 32
- 33. Spring XML DSL <route id=“processOrders”> <from uri=“activemq:orders”/> <choice> <when> <simple>${header.customer-rating} == ‘gold’</simple> <to uri=“ibmmq:topic:specialCustomer”> </when> <otherwise> <to uri=“ftp://user@host/orders/regularCustomers” /> </otherwise> </choice> <log message=“received new order ${body.orderId}”/> <to uri=“ibatis:storeOrder?statementType=Insert”/> </route> 33
- 34. Enterprise Integration Patterns • Message Routing • Transformation • Aggregation • Splitting • Resequencer • Routing Slip • Enricher • All from the book! 34
- 35. Components • Prepackaged bits of code • Highly configurable • Maximum interoperability • Used to build “Adapters” to existing systems • Don’t reinvent the wheel and end up with a box 35
- 36. Components http://camel.apache.org/components.html • ActiveMQ, Websphere, Weblogic (JMS) • AMQP • HTTP • ATOM feeds • IRC • AWS (S3, SQS, SNS, others) • jclouds • Bean • JDBC • Cache (EHCache) • Jetty • CXF (JAX-WS, JAX-RS) • Twitter • EJB • MQTT • Drools • MyBatis • File • JPA • FTP • Spring Integration • Google App Engine 36 • GMail • Spring Web Services To see list of all components!!
- 37. Components • URI format: • scheme:localPart[?options] • scheme: identifies the “component” • localPart: specific to the component • options: is a list of name-value pairs • Creates endpoints based on configuration • Route endpoint “factories” • Integrate with Camel Routes by creating producer/ consumer endpoints 37
- 38. Another Example public class MyExampleRouteBuilder extends RouteBuilder { @Override public void configure() throws Exception { from(“aws-sqs://demo?defaultVisibilityTimeout=2”) } } 38 .setHeader(“type”).jsonpath(“$[‘type’]”) .filter(simple(“${header.type} == ‘login’”) .to(“jms:quote”);
- 39. Test Framework • Powerful way to test your Camel routes • http://camel.apache.org/mock.html • Uses Mocks • Mocks vs Stubs? • http://martinfowler.com/articles/mocksArentStubs.html • Provides declarative testing mechanism • Declare • Test • Assert 39
- 41. Developer Tooling Support Fuse IDE 41
- 42. JBoss Fuse (aka Fuse ESB) 42
- 43. JBoss Fuse (aka Fuse ESB) 43
- 44. Live Demo can be found here: https://github.com/christian-posta/camel-sqs-example 44 44
- 45. Resources 45 45
- 46. Dzone Refcardz REFCARDZ • Camel Essential Components • http://refcardz.dzone.com/refcardz/essential-camel-components • Essential EIP with Apache Camel • http://refcardz.dzone.com/refcardz/enterprise-integration 46
- 47. Apache Community • http://camel.apache.org • Mailing list: users@camel.apache.org • Nabble Archive: http://camel.465427.n5.nabble.com/Camel-Users-f465428.html • Source code: http://svn.apache.org/viewvc/camel/trunk/ • Blogs, Articles, Examples • http://camel.apache.org/articles.html • http://camel.apache.org/user-stories.html • http://camel.apache.org/user-stories.html • http://www.davsclaus.com • http://www.christianposta.com/blog 47
- 50. Questions 50